package com.itheima.web;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @description:替换HttpServlet,根据请求的最后一段进行方法分发
 * @author: yanhongwei
 * @date: 2023/3/16 19:51
 * @param:
 * @return:
 **/
public class BaseServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求路径

        String uri=req.getRequestURI();

        int index=uri.lastIndexOf("/");
        //2.获取最后一段路径.方法名
        String methodName=uri.substring(index+1);

        //2.执行方法
        Class<? extends BaseServlet> aClass = this.getClass();

        try {
            Method method = aClass.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);

            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}
